/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.format.support;

import java.beans.PropertyEditor;
import java.beans.PropertyEditorSupport;

import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.format.Formatter;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * Adapter that bridges between {@link Formatter} and {@link PropertyEditor}.
 *
 * @author Juergen Hoeller
 * @since 4.2
 */
public class FormatterPropertyEditorAdapter extends PropertyEditorSupport {

    private final Formatter<Object> formatter;


    /**
     * Create a new {@code FormatterPropertyEditorAdapter} for the given {@link Formatter}.
     *
     * @param formatter the {@link Formatter} to wrap
     */
    @SuppressWarnings("unchecked")
    public FormatterPropertyEditorAdapter(Formatter<?> formatter) {
        Assert.notNull(formatter, "Formatter must not be null");
        this.formatter = (Formatter<Object>) formatter;
    }


    /**
     * Determine the {@link Formatter}-declared field type.
     *
     * @return the field type declared in the wrapped {@link Formatter} implementation
     * (never {@code null})
     * @throws IllegalArgumentException if the {@link Formatter}-declared field type
     * cannot be inferred
     */
    public Class<?> getFieldType() {
        return FormattingConversionService.getFieldType(this.formatter);
    }

    @Override
    public String getAsText() {
        Object value = getValue();
        return (value != null ? this.formatter.print(value, LocaleContextHolder.getLocale()) : "");
    }

    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        if (StringUtils.hasText(text)) {
            try {
                setValue(this.formatter.parse(text, LocaleContextHolder.getLocale()));
            } catch (IllegalArgumentException ex) {
                throw ex;
            } catch (Throwable ex) {
                throw new IllegalArgumentException("Parse attempt failed for value [" + text + "]", ex);
            }
        } else {
            setValue(null);
        }
    }

}
